With respect to those who have already done these, I decided to improve the menu track diagrams for Nurburgring and Istanbul, along with a better Turkish flag for the Istanbul car monitor menu screen.
*This is now a complete package including main menu track selection pictures (thanks to Melphiz) and game loading 2012 style circuit diagrams.
Installation instructions included in the zip file.
Note that this mod can only be used by those who have the appropriate b_nonpersistent.pssg file that includes both Nurburgring and Istanbul.
I hope you enjoy!